Lock.



l. GISSER.

LOCK.

APPLICATION. FILED OCT- s. 1911.

Patented. May 28, 1918.

isrnoia erssnn, or BROOKLYN, NEW YORK.

LOCK.

Specification of Letters Patent.

Patented May as, rai s.

Application filed October 3, 1917. Serial No. 194,435.

To all whom it may concern: 1

Be it known that I, Isrnon Grssnn, a subject of the Government of Russia, residing at the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Locks, of which the following is a specification.

The invention relates to improvements in looks and has particular reference to the type of locks usually placed upon doors.

The primary object of the invention is the provision of a lock which is simple in construction, easily operated with the proper key and which can be produced at small cost.

Anotherobject of this invention is to provide a lock in which a large Variety of keys may be used, one key varying very slightly from the other, but only one type of key operating a given look.

I obtain this object by using a lock provided with the usual form of sliding bolt upon one side of which I provide several notches thereby forming teeth similar to that in a rack. Immediately, above the teeth of the bolt and in the side of the lock, I provide a circular aperture or keyway to receive the key, which is preferably circular in cross section. At the end of the key, I provide a short lever, which is hingedly attached to the former. When the key is inserted into the aperture, the hinged lever is adapted to drop down until it is at right angles to the key and thereby engages with the teeth in the sliding bolt. If the key now be turned, the bolt will move in or out of position.

' Other details and advantages of my device will be apparent from the detailed description and the accompanying drawing forming a part of this specification in which similar numerals refer to similar parts in all the views, and in which Figure 1 is a plain view of a lock with the top plate removed, showing the interior; Fig. 2 is a section taken on line 2-2 of Fig. 1 and 'showing a key in position; Fig. 3 is a section on line 3-3 of Figs. 1 and 2; Fig. 4 is a side view of a key; Fig. 5 is a side view of a key at right angles to that of Fig. 4; Fig. 6 is a section taken on line 6-6 of Fig. 2 showing a cross section of a key and the keyway, and Fig. 7 is a section showing a modified keywa listening to the drawings, the lock concngage with the catch 15.

sists of the outer casing 1 and the cover 2 I which is provided with a projecting cylindrical keyway 4 which is adapted to fit into a hole in the door to which the lock is attached. The bolt 5, preferably rectangular in cross section is provided with a number ofteeth 6 and is adapted to slide within the casing 1 passing through the slot 7 in the side of the latter. The bolt 5 is held in position by mean of the outer and bottom plates of the casing 1, the slot 7 the lugs 8 and 9,:1nd the plate 3 attached to the cover 2. The key 10 is circular in cross section and is provided at. its end with a lever 11 which is hingedly connected to it by means of pin 12. The lever 11 when folded-over will fit into the slot 18. The

key 10 is inserted into the hole in the keyway 1 until its end fits into the hole 14 in the outer plate of the casing 1. This permits the lever 11 to assume a position at right angles to the key 10 in which case its end engages with the teeth 6 of the bolt 5. It will now be evident that when the key 10 is turned in the keyway 4:, the bolt 5 will be moved so as to either engage or dis- The key 10 is provided with one or more projecting pins 18 and 19 which pass through the corresponding grooves 16 and 17 in the keyway 4. The pin 18 is located so as to clear the keyway 1 when the key is inserted into its full depth, while the pin 19 is located so as to slide within the annular groove 20 when the key is rotated.

In order to have a large variety of keys, the position of the groove 20 and its corre sponding pin 19 is varied in the different locks. Similarly the angular relation between the grooves 16 and 17 is varied as is clearly brought out in Figs. 6 and 7 If desired an additional longitudinal groove parallel to the grooves 16 and 17 and its corresponding pin on the key may be used or a transverse groove parallel to groove 20 and a corresponding pin on the key may be added. The locks and keys may also be varied by varying the length of the lever 11 and the corresponding distance between the center of the key and the top of the teeth 6 on the bolt 5.

In order to lock the bolt 5 in position, I provide the following: The bar 22 having its end 23 shaped so as to fit between the teeth 6 of the bolt 5, has a horizontal portion 25 which is provided with a hole fitting over the pin 24 and a tapered portion 26. lVhen the key is not within the lock, the bar 22 Will drop down due to the action of gravity until its end 23 engages with one of the teeth 6 and thereby will lock the bolt 5 in position. If desired a spring may be used to assist,

gravity in keepingthe end 23 of the bar-'22 engaged with the teeth =6. When the key'is inserted into the keyway 4, its end will press against the tapered portion 26 of the bar until it is raised and thereby the end '23 of the bar 22 is disengaged from the teeth 6.

If it be desired to lock the bolt 5 on the inside of the room so that the lock could not beopeued with the key from the outside, the knob 28 may be moved within ith'e slot 29 unxtil its end comes overthe projecting lug 27 of the bar 22 and thereby locks the end 23 against the tooth 6, so that it cannot be raised with the key.

The belt 5 may be moved laterally without the aid of'a key on the inside of the room :by means of theknob 30 fixed to the bolt 5 and sliding within the slot 31. in the casing 1.

30pm to! this pat ent may be obtained tor It is evident that modifications of the construction shown hcrcwlth may be made cmploying the general teatures herein disclosed, I therefore do not wish to limit myself to the exact construction shown, but wish to claim all equivalents.

' Having thus described my invention, I claim as new and wish to secure by Letters Patent.

In a lock, the combination of a bolt having notches at the side thereof, a key having a lever hingedly attached to the end thereof ISIDOR GISSER.

five cents each, by addressing the commissioner of Paton", Washington, 1).0." 

